Trimming machine



Aug. 10, 1943. v s. R. KELLER 2,326,227

TRIMMING MACHINE Filed Sept. 30, 1.942 5 Sheets-Sheet l AT'I'D RNEYS Aug. 10, 1943. s. R. KELLER 2,326,227

TRIMMING MACHINE Filed Sept. 30, 1942 3 Sheets-Sheet 2 ATTORNEYS Aug. 10, 1943. s. R. KELLER 2,326,227

TRIMMING MACHINE Filed Sept. 30, 1942 3 Sheets-Sheet 5 IN V EN TOR.

I to essential 'peditious manner.

I I4 rotatably supporting a one end of the shaft l6, which I i a. 1 5 3 .7 V TRIMMiNG w r fi Snencier-llti keuer, ntnflieygvvfval J 30, iei-zQsi-iififitmzsr:,

g ter J nmetnaszzi inountedron thelibase rmmedtrcr My invention relatesto cutting and has among its objectsand' advantagesprovh v sion -ofan improved machine for trimming cutter g bitsofthe type-'employedfin cuttenchainsf offcoal min'ingmachinesp r r {7 In present day methods of n'lining coalpkerfs 1 or'- grooves-a-re out in -the face ef thevih to provide a 'ciearance 'for th coai it is I blasted; Such grooves are out tnmu'gn: themediumof an endlesschain wifl'rcutter bits.- Such bits wear off and beoome duil'w'hich I drivingla V betta34 passmgr armmdzareiativ ly. largesIieaveSBattaciied c to the shaft 28;? 1 The cutter 2' 18 is pr'ovided-wvith as dove tailigroove' ssforthereception mvitwespaeeacutters. 40 adjustableiztowarm anniaway: L from require replacement by sharp bits. -1n axidition shar ness, the bits must be uniform as toshape and size." Machines have been devised to shape and sharpen such bits, such as the machine disclosed in Patent No.'j1,604,865, issued October 26, 1926.- ,Such machine methods of shaping and sharpening bits arecsatisfactory' with respect toproductioncapacity but a large 7 number of :bits are formed with feather edges v and webs which must be removed is of proper shape and sharpness.

g 20' before the Accordingly, an object of my invention is to 7 provide a machine for removing feather'edges and webs on cutter bits in'an accurate and'ex-' In the accompanying drawings:

Figure 1 is a face view of a machine in ac- Figure 6 is a perspective view of a tool positioning member; 1

Figure '7 is a perspective view of a portion of a conventional cuttercbit illustrating objectionable web formations thereon; and

Figure 8 is a perspective view of a companion tool positioning means. r

In the embodiment selected for illustration,

I make use of a base frame structure In and an upper frame structure l2 providedwith bearings shaft the face; 14.

Hi. In Figures 3, v

4 and 5, a cutter head I8 is fixedly secured to I head is provided with an arm 20 pivotally connected at 22, see

Figure 1, witha crank arm 24 connected with .an eccentric 26 attached to a shaft 28 supported in bearings 30 mounted on the base frame; I0.

Thus oscillatory motion is imparted to the out: I

Cut n he lower partof the head to provide 1 ance for material cut from th bits 7 e greater a a 46 is provideddn 1=thei "tersfllr .To the upper frame structureil 2 is fiXdlYCQfif g 58 andjhavinga'recess 1 fiflfin'its upper end, see Figure 8, for'the recep xg .tion of a bit holding'body 62 havingalgroove contour of the'tapered back face"? 7 I 66 illustrated on the bit'68 of Figu're 'l; The body}; if

62 is fixedlysecured in the 'recesslill byreason a of a setscrew TIL-engaging a'pressure plate 12 each otherfby screws fl' havingiend engagement with the-irrespective cutters" andfi'threadedz into supportsrfl nn the 181 rnnovetailiggroove 7 head zltewhich groove is .1 arranged 'at right the dovetail groove f,

eta-a anvetaiiisashaving ag 5 bit positioning webffiu having a face 52;;lyingl 1 V in a plane common to-thefaces 5 4offthe cut- M -message .nected a body '56 by bolts- 64 shaped to the lying in engagement with the body 62.

Referring to Figure '7, the-bit 68' is provided with a leading face 14 terminating in a sharp point 16 by reason of its. int'ersectionfwith the arranged at anan- V is also trueof thel' V point structure of thebit; Many bits'are forged with a feather edge or web .82 which must f be removed before thebit is of the desired shape r j I r rear face 66. The face is. gle to the shank 18, which and sharpness. a

To remove the objectionable formation 82; the point structure 80 of the bit is inserted in the recess 64 withthe face 14 of the bit engaging the face 52 of the web50. This positions the face 14 in a planecommon to the faces" 54 of the cutters" 1 40, so that oscillation of the head I 8 will bring c the cutting edges 84 into engagement with the formations 82 to sever the latter'in the plane of Figure 1 illustrates the relation of cthe pointed end of the bit with respect to the cutting edges 84-. The'head IB'is oscillate'd'through an are which causes each cutting edge 84 sever r the formation 82hon its'respective side of the bit only. In addition, the cutting action is in I e d y from the outer side of thebit so *asito a eliminate ny p ojecting featheredg s The head!!! is cut away at as to'lprovide clearance "also for the shank 18 of the bit. Aqreces s-tla is clearpart ofthe head'lies beneath the axis o f' 'the Without further elaboration, the foregoing will so fully illustrate my invention; that others may,

by applying current knowledge, readily adapt the samefor use under various conditions of service.

I claim: s

v 1. A machine for trimming cutter bits havingtionary body having an angular recess shaped to receive the bit portion of the cutter bit to urge a work face and obstructive formations projecting beyond the. face comprising an oscillatory head having spaced cutting means thereon, a cutter bit stop located between said cutting means V said dovetail bodies to hold the latter in predeand engageable with said work face tohold the; i s work face in theplane of 'said cutting means, a; i cutter bit support for positioning .thecutter bit' against said stop, and means for 'oscillat ingsaido head to; bring said cutting means alternately'into W trimming engagement with theobstructive for mations.

2. A machine for trimming cutter bitshaving 'aiwork face and obstructive: formationsiproject- 'ing' ibeyond the: face comprising an oscillatory head "having spacedi cutting "means; thereon-,1 a cutter biti stop. located'zz'between said cutting means :and' engageable withTSaid work facx to hold thewwork Iace' in.-the:plane of said:cutting 7 means, a cutter bit support vforpositioning,the cutterbit against said1stop,;-and means for oscilj lating said-:headito bring!said cuttingmeans al- V ternately intogtrimming engagement'withethe ob- :s'tructive formations and inwardly'ofl said face. '7

:'3. The;invention described in;c1ai1n lawherein 1 ,said cutter bit support comprises a relativelystathe latter against said stop.

irThe invention descr bed in claim 1 wherein said cutting means are adjustably mounted on said 1 head 'for relative adjustment toward and away iromeach other,"

'15. The invention described in claim 1 wherein said head is provided with a dovetail groove and in which said cutting means comprise dovetail bodies "slidable in said groovejand screws threaded in said head and respectively engageable with termined spaced relationship.

" framestructure, an armfixed to said head; a

I drive shaft mountedon said framestructure and having an eccentric, and an operating connec-- -'tion between. saidlarmfand the eccentric; Y -'I-. A-machine fortrimmingcutter bits having work, faces and ;obstructive 'gformations thereon projectingbeyondthe work faces comprising.

tive'formationsmovabl and spaced cutting means,;a cutter bit .support-ior holding the cutter bit'in trimming relationship with said cutting: means, stop neans coactinge with said cutter bit support for, positioningv1thework faces inthe planesof said cuttingmeans, and means, for bringing said cutting means lintoalternate engagement with obstruc- SPENC Ri -aKELLEI-L 

